A senior Arizona congressman is calling on Robert Mueller, special counsel for the Justice Departments investigation into Russias election meddling, to resign.

Rep. Trent Franks, a Republican who sits on the House Judiciary Committee, said in a statement Tuesday that Mueller is in violation of the law that prohibits Mueller from serving as a special counsel if he has a conflict of interest.

Mueller and former FBI Director James Comey have been longtime allies dating back to 2003 when the men both worked in Washington, Mueller as the FBI Director and Comey as Deputy Attorney General. Franks cited the pairs relationship as a reason for Mueller to be disqualified from the probe.

Bob Mueller is in clear violation of federal code and must resign to maintain the integrity of the investigation into alleged Russian ties, Franks said. Those who worked under them have attested he and Jim Comey possess a close friendship, and they have delivered on-the-record statements effusing praise of one another.

President Trump had also called Muellers relationship with Comey bothersome.

Franks also cited reports that Mueller hired at least three lawyers who have donated exclusive to Hillary Clinton as well as a bevy of other Democrats.

Until Mueller resigns, he will be in clear violation of the law, a reality that fundamentally undermines his role as Special Counsel and attending ability to execute the law, Franks said.